The two major categories of extracellular signaling molecules that bind to cell surface receptors are ____
a. peptide hormones and steroid hormones
b. steroid hormones and neurotransmitters
c. neurotransmitters and vitamins
d. growth hormones and vitamins
e. peptide hormones and neurotransmitters
ANSWER: e
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A famous marathon runner has been having trouble conceiving, and her doctor has advised taking a break from the sport -- why?
A. Excessive exercise can lower gonadotropin-releasing hormone (GnRH) levels, disrupting ovulation. B. The shaking movement that running produces can prevent implantation of the embryo. C. Excessive exercise can raise humen chorionic gonadotropin (hCG) levels, disrupting ovulation. D. High body temperatures are disruptive to oocyte production, which normally form at 34°C.
Which area of the cerebrum deals with learned patterns or motor skills?
a. Broca's area b. Wernicke's area c. prefrontal cortex d. premotor cortex e. hippocampus
Allocation of carbon to roots directly increases both respiration and photosynthesis rates
Indicate whether the statement is true or false
If the Hardy-Weinberg equilibrium is met, what is the net effect?
A. evolution leading to a population better adapted to a changing environment B. very slow and continuous evolution with no increased adaptation C. no evolution because the alleles in the population remain the same D. evolution leading to a population better adapted to an unchanging environment